Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Post-Traumatic Stress Disorder

Post-traumatic stress disorder is caused by exposure to a highly traumatic experience. Symptoms usually include nightmares and flashbacks where the event is re-experienced over and over again. These recurring memories can become overbearing and interfere with the brain's ability to learn and consolidate [ For more on 'consolidate' go here: http://www.braingle.com/mind/415.html ] new information.

PTSD is considered to be primarily an anxiety disorder that should subside after several months, but in extreme cases symptoms can last much longer. Long term stress [ For more on 'stress' go here: http://www.braingle.com/mind/534.html ] like this can cause permanent damage to the brain due to the build up of the stress hormone, cortisol [ For more on 'cortisol' go here: http://www.braingle.com/mind/629.html ].
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For more mind exercises: http://www.braingle.com/mind/